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Zoekopdracht: journal id: "astrophysicalxjournal"

AuteursS. Mathur, R. Handberg, T.L. Campante, R.A. Garcia, T. Appourchaux, T.R. Bedding, B. Mosser, W.J. Chaplin, J. Ballot, O. Benomar, A. Bonanno, E. Corsaro, P. Gaulme, S. Hekker, C. Regulo, D. Salabert, G. Verner, T.R. White, I.M. Brandao, O.L. Creevey, G. Dogan, Y. Elsworth, D. Huber, S.J. Hale, G. Houdek, C. Karoff, T.S. Metcalfe, J. Molenda-Zakowicz, M.J.P.F.G. Monteiro, M.J. Thompson, J. Christensen-Dalsgaard, R.L. Gilliland, S.D. Kawaler, H. Kjeldsen, E.V. Quintana, D.T. Sanderfer, S.E. Seader
TitelSolar-like oscillations in KIC 11395018 and KIC 11234888 from 8 months of Kepler data
TijdschriftAstrophysical Journal
FaculteitFaculteit der Natuurwetenschappen, Wiskunde en Informatica
Instituut/afd.FNWI: Astronomical Institute Anton Pannekoek (IAP)
SamenvattingWe analyze the photometric short-cadence data obtained with the Kepler mission during the first 8 months of observations of two solar-type stars of spectral types G and F: KIC 11395018 and KIC 11234888, respectively, the latter having a lower signal-to-noise ratio (S/N) compared with the former. We estimate global parameters of the acoustic (p) modes such as the average large and small frequency separations, the frequency of the maximum of the p-mode envelope, and the average line width of the acoustic modes. We were able to identify and to measure 22 p-mode frequencies for the first star and 16 for the second one even though the S/N of these stars are rather low. We also derive some information about the stellar rotation periods from the analyses of the low-frequency parts of the power spectral densities. A model-independent estimation of the mean density, mass, and radius is obtained using the scaling laws. We emphasize the importance of continued observations for the stars with low S/N for an improved characterization of the oscillation modes. Our results offer a preview of what will be possible for many stars with the long data sets obtained during the remainder of the mission.
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